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Münster 2002 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 30: Nuclear Physics / Spectroscopy IV

HK 30.3: Talk

Wednesday, March 13, 2002, 14:45–15:00, B

Evidence for proton excitations in 130−136Xe isotopes from measurements of g factors of first excited 2+ and 4+ states+ — •K.-H. Speidel1, R. Ernst1, G. Jakob2, N. Benczer-Koller2, G. Kumbartzki2, J. Holden2, T.J. Mertzimekis2, A.E. Stuchbery3, A. Pakou4, P. Maier-Komor5, A. Macchiavelli6, M. McMahan6, L. Phair6, and I.Y. Lee61Institut für Strahlen- und Kernphysik, Univ. Bonn, D-53115 Bonn — 2Dept. of Physics and Astronomy, Rutgers Univ., New Brunswick, NJ 08903, USA — 3Dept. of Nuclear Physics, Australian National Univ., Canberra ACT 0200, Australia — 4Dept. of Physics, Univ. of Joannina, Greece — 5Technische Univ. München, D-86748 Garching — 6Lawrence Berkeley National Lab., Berkeley, CA 94720, USA

The g factors of the 21+, 41+ and 22+ states in the stable 130−136Xe isotopes have been measured via projectile Coulomb excitation in inverse kinematics in combination with the transient field technique. Isotopically pure Xe beams were provided by the 88-inch LBL cyclotron. The results show a steady decrease in g(21+) as the number of neutron holes increases in the lighter nuclei below the closed N=82 neutron shell. The g factors of the 41+ states in 132,134Xe are consistently larger than the g factors of the 21+ states, a characteristic of proton excitation. In contrast, the g factors of the 21+, 41+ and 22+ states in 130Xe are approximately equal as would be expected for a vibrational nucleus.

+ supported by BMBF and DFG

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